can i move up\down in aspect ratio?

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  • eran_k
    • Feb 2026
    #1

    can i move up\down in aspect ratio?

    I find it difficult to find tires for my bike (in my country) importing is a bureaucratic hell.
    the stock size is 3.00X18 front and 3.50X18 rear. this translate to 90/90-18 and 110/90-18.

    If i'll move to 80 aspect ratio and fit 100/80-18 front and 120/80-10 rear i'm only loosing about 10 mm of ride height and i believe the rims will accept the slightly wider tires.
    what effects will it have on handling etc...?

    Same question for going up to 100% aspect ratio?

    Thanks
    Eran
    Tags: None
    • Guest
      #2
      I use 100/90-18 front and 110/90-18 rear on mine and they're fine. I run Pirelli Sport Demons and love them.

      Not sure how different the 80 series will be, but I think 120 width on the rear will be getting close to the chain.

        Comment

        • eran_k
          #3
          i found a set of 3.50 and 4.00 kenda k270 tires
          the 3.50 is "rear" too, can i put it on the front?

            Comment

            • Steve
              GS Whisperer
              • Jun 2005
              • 35925
              • southwest oHIo
              #4
              You sure you want knobbies on your 400?

              If you do put a rear tire on the front, be sure to turn it around so the "drive direction" arrow points the opposite way.

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                Comment

                • Agemax
                  Forum Guru
                  • Apr 2008
                  • 8371
                  • plymouth uk
                  #5
                  you wont be losing 10mm of ride height. the middle number of the tyre size is a percentage of the tyre width, not a measurement.
                  a 90/90 height is 81mm (90% of 90) and a 100/80 is 80mm(80% of 100), so you only lose 1mm
                  1978 GS1085.

                  Just remember, an opinion without 3.14 is just an onion!

                    Comment

                    • eran_k
                      #6
                      thanks,
                      yes i know it's a knobbie, it's the look i'm after (scrambler,tracker etc...)
                      so it should be no issue to use it on the front if i reveres it, good to know.
                      what about going 1 aspect ratio lower?

                        Comment

                        • Agemax
                          Forum Guru
                          • Apr 2008
                          • 8371
                          • plymouth uk
                          #7
                          why would you want low profile knobbies?
                          1978 GS1085.

                          Just remember, an opinion without 3.14 is just an onion!

                            Comment

                            • eran_k
                              #8
                              Originally posted by Agemax
                              you wont be losing 10mm of ride height. the middle number of the tyre size is a percentage of the tyre width, not a measurement.
                              a 90/90 height is 81mm (90% of 90) and a 100/80 is 80mm(80% of 100), so you only lose 1mm
                              your right off course,i was doing the math for same tire width with different aspect.
                              110/90 vs 120/80 will be 3mm, i gues i should be ok with 1mm front and 3mm rear?

                                Comment

                                • eran_k
                                  #9
                                  Originally posted by Agemax
                                  why would you want low profile knobbies?
                                  i don't, just checking different option from the limited selection i have

                                    Comment

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